Communications: electrical – Continuously variable indicating – With meter reading
Patent
1990-02-20
1992-07-07
Yusko, Donald J.
Communications: electrical
Continuously variable indicating
With meter reading
34082508, 340505, G05B 2300
Patent
active
051286661
ABSTRACT:
An interface and protocol for linking devices (18) with a control unit (10). The interface includes a dedicated request line (30) per device, a dot-ORed acknowledge line (32), at least one clock line (38) transmitting sets of N clock pulses from the control unit to a device during each data exchange, two data line (34, 36) for serial duplex data transmission and a pair of shift registers one being positioned in the control unit and another being positioned in each of the devices. The protocol is such that for either a read or a write operation the control unit issues two request signals in spaced relationship on the request line and the selected device responds with two acknowledge signals is spaced relationship on the acknowledge line with each one of the acknowledge signals falling after the fall of its associated request signal.
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Munier Jean-marie
Poret Michel
Robbe Jean-Claude
Cockburn Joscelyn G.
National Business Machines Corporation
Weissman Peter
Yusko Donald J.
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